天津港区杨树绿化生长效果的调查研究

杨树是我国北方造林绿化的主要树种,但由于抗盐碱能力较差,导致盐碱地区尤其是滨海重度盐渍区发展缓慢,人们担心杨树在该地区的长期适应性及其生长效果。作者对天津港区多年生的杨树绿地进行了全面调查,结果表明：①在客土绿化条件下,杨树生长表现良好,土壤盐害降低、肥力增强的变化趋势明显,提高了杨树在滨海盐渍区的长期适应性和稳定性。②毛白杨和欧美杨表现突出,年均生长量树高〉1.1m,胸径〉1.2cm;新疆杨冠幅小、生长量低、效益差。③杨树的生长状况与立地条件关系密切,毛白杨的年均生长量与土壤有机质呈显著正相关、与土壤全盐量呈显著负相关关系。因此,增加土壤有机质和降低含盐量的技术措施均能促进其生长,提高绿化效果。

The Research of the Growth Effect of Green Poplar in Tianjin Port

Poplar is the main tree species in afforestation in North China.The salt resistance ability of Poplar is poor which caused saline-alkali area especially Binhai severe saline area develops slowly.The long adaptability and growth effect of poplar is worrying in the region.There is a comprehensive survey to perennial poplar green of Tianjin Port in the paper,the results showed that： ① in the condition of the soil planting,the performance of poplar growth is good,soil salinization reduces,fertility changes obviously,it is implied that the long-term stability and adaptability of poplar is improved in Binhai saline area.②the performance of Poplar and Populus is outstanding,the average annual growth increment of tree height is 1.1m,Diameter at breast height is 1.2cm;the crown of Xinjiang Yang is small,growth quantity is low,benefit is poor.③The relationship between the growth of poplar and site conditions is close,the annual volume growth of Populus tomentosa had a significant positive correlation with soil organic matter,had a significant negative correlation with the total salt content in soil,technical measures,increasing soil organic matter and reducing salt content,can promote growth and increase the greening effect.